Feed water heater of the injector type



9 H. E. GRESHAM ET AL I FEED WATER HEATER OF THE INJECTOR TYPE FiledJuly 11, 1931 2 Sheets-Sheet l b/- 5. gra am 1 H. E. GRESHAM ET AL1,944,080

FEED WATER HEATER OF THE INJECTOR TYPE 2 Sheets-Sheet 2 Jan. 16, 1934.

Filed July 11, 1,931

Fig.3

/ ve TdKS 5Y1 MWW Patented Jan. 16, 1934 UNITED STATES PATENT QFFECETYPE Harry Edward Gresham and James Neville Gresham, Salford,Manchester, England Application July 11, 1931, Serial No. 550,182, andin Great Britain April 14, 1931 4 Claims.

. This invention relates to feed water heaters of the injector type.With such heaters, it is found that owing to the high temperature of thefeed water in the heater, deposits of hardness salts 5 from the feedwater tend to occur very rapidly in the heater, such salts adheringtenaciously to thecones and quickly restricting their bore.

The object of our present invention is to provide an improvedconstruction of heater in which the whole of the cones can be readilyremoved as a single unit without breaking any pipe joints,

so that the substitution of a new unit can be made expeditiously. Afurther object of our invention is to provide a construction of heaterin which all the cones are held in their correct relative positionsWithout the use of screwed joints.

A heater in accordance with our invention comprises a unitary structureconsisting of inlet, intermediate and delivery cones held togetherwithout screwed joints and secured in position by a cap in the heatercasing, the removal of said cap permitting of the removal of the unitarystructure by a plain axial movement.

Referring to the accompanying explanatory drawings:

Figure 1 is a sectional elevation and Figure 2 a plan view of one formof feed water heater constructed in accordance with our invention.

Figure 3 is a sectional elevation and Figure 4 an end elevation lookingfrom the left of Figure 3, of a modified construction of feed waterheater in accordance with our invention.

The same reference letters in the different views indicate the same orsimilar parts.

In Figures 1 and 2, the heater proper is adapted to be inserted directlyinto a boiler, part of the shell of which is indicated at a. The partexternal to the boiler is flanged at b for attachment to the boiler andhas a side connection 0 leading from the injector (not shown) whichdelivers the feed water to the heater. Such connection may, if desired,have a stop and or feed check valve 01 thereon. The final or deliverycone e of the heater is combined with a ported cylinder 1 with aninternal seating g, upon which rests the intermediate cone h which isheld in position by projections i from the inlet cone 7 which is itselfsecured to the end of the cylindrical extension ,7 or" the delivery conee by studs is passing through a flange upon the inlet cone and through aflange m upon a portion of a head piece 11. which has apertures otherein for the inflow of the feed water to the inlet cone 7', and atapped aperture 10 in its end face into which an eye bolt or the likecan be secured to facilitate the axial withdrawal of the cones as aunitary structure from the heater. A cap q screws into the end of theheater casing and bears upon said head piece 11. to hold the structurein position,

when an external shoulder 1' upon the cylindrical descaling or. cleaningpurposes.

extension of the delivery cone e seats upon an internal shoulder in theflanged part of the heater casing.

Steam from the boiler enters the heater through the ports t to pass intothe water jet issuing from the cone 7'. Further steam enters through theports u to pass into the Water jet between the intermediate cone h andthe delivery cone or nozzle e. The latter cone or nozzle delivers theheated feed water laterally as shown by the arrow 1), Figure 2.

A stop pin or stud w engages a hole or slot in the head piece 12 for thepurpose of preventing rotary movement of the heater cones and to ensurecorrect setting in the boiler.

It will be seen that if the cap q is removed and an eye bolt or the likebe screwed into the hole p, the Whole of the heater parts (that is thenozzle e and its cylindrical extension the cones h and 7' and the headpiece it) can be Withdrawn as a single unit and then by releasing thescrewed studs k, the cones :i and k can be withdrawn for There is then aclear passage way for sealing or cleaning the nozzle e.

Instead of arranging the heater with the cones within the boiler steamspace, it may as shown in Figures 3 and 4, be arranged entirely on theexterior of the boiler, the flange b upon the heater by which it issecured to the boiler having therein a steam inlet port or branch :1:and a feed outlet branch y. There is a cap 2 at the delivery end of theheater casing; by the removal of the caps z and q at both ends of theheater, complete access to the casing is available for cleaningpurposes.

With our construction, it is unnecessary to break any pipe joints inorder to remove all the cones of the heater for cleaning or renewal. thecones fit together without screwing, they can even though heavily coatedwith scale be readily taken apart.

It will be appreciated that the invention is not concerned with aconstruction in which the nozzles are formed as a unit structure as sucha construction would not fulfill the objects of the invention; neitheris the invention concerned with a nozzle structure which is screwthreaded into the heater casing.

What we claim is:

1. A feed Water heater of the injector type comprising in combination aheater casing having an internal shoulder therein, a delivery conehaving a cylindrical extension provided with an internal seat and anexternal shoulder seated.

upon said internal shoulder and also with ports for communication with asource of steam, an intermediate cone within said cylindrical extensionresting upon said internal seat, an inlet cone within and secured tosaid cylindrical ex'e tension adjacent said external shoulder to.holdsaid intermediate cone upon said internal seat, and means associatedwith said heater casing to maintain said cylindrical extension with itsexternal shoulder upon said internal shoulder.

2. A feed water heater of the injector type comprising in combination aheater casing having an internal shoulder therein, a delivery conehaving a cylindrical extension provided with an internal seat and anexternal shoulder seated upon said internal shoulder and also with portsfor communication with a source of steam, an intermediate cone withinsaid cylindrical extension resting upon said internal seat, an inletcone within and secured to said cylindrical extension adjacent saidexternal shoulder and having longitudinal projections engaging with saidintermediate cone to hold said intermediate cone upon said internalseat, a head piece within said heater casing, and a cap screwed intosaid heater casing to bear upon said head piece to maintain saidcylindrical extension withits external shoulder upon said internalshoulder.

3. A feed Water heater of the injector type comprising in combination aheater casing having an internal shoulder therein and a branch forconnection to a boiler feed pipe, a delivery cone having a cylindricalextension provided with an internal seat and an external shoulder seatedupon said internal shoulder and also with ports for communication with asource of steam,

an intermediate cone within said cylindrical extension resting upon saidinternal seat, an inlet cone within said cylindrical extension andhaving a flange seated upon said cylindrical extension adjacent saidexternal shoulder, a flanged head piece within said heater casing withits flange adjacent the flange of said inlet cone, studs passing throughsaid flangesand into said piece to maintain siad cylindrical extensionwith its external shoulder upon said internal shoulder and removable topermit the removal of said unit structure by a plain axial movement.

4. A feed water heater of the injector type comprising in combination aheater casing having an internal shoulder therein and a branch forconnection to a boiler feed pipe, a delivery cone having a cylindricalextension provided with an internal seat and an external shoulder seatedupon said internal shoulder and also with ports for communication with asource of steam, an intermediate cone within said cylindrical extensionresting upon said internal seat, an inlet cone within said cylindricalextensionandhaving a flange seated upon said cylindrical extensionadjacent said external shoulder, aflanged head piece having an aperturein its outer-end .face disposed within said heater casing with itsflange adjacent the flange of said inlet cone and ported for the entryof the feed water op-.

posite said branch, studs passing through said flanges and into saidcylindrical extension to hold said head piece, inlet cone, and'deliverycone together as a unit structure, and a cap screwed into said heatercasing to bear upon said head piece to maintain said cylindricalextension with its external shoulder upon said internal shoulder andremovable to permit the insertion of a member into said aperture for theremoval of said unit structure by a plain axial move-,

ment.

HARRY EDWARD GRESHAM. JAMES NEVILLE GRESHAM.

